This is an interesting question because to
answer it we have to look at the climate on a
global scale. Simply put, rainfall isn’t going
to decrease or increase the same all over the
planet as it warms. Some places will get more
rain, some places will get less, and some will
stay the same as they are now. In fact, places
where lots of evaporation occurs (like the
sub-tropics), are likely to get more rainfall as a
result of global atmospheric warming, since a
warmer atmosphere can hold more water vapor.
However, places like the Sahara desert, where
evaporation is scarce and temperatures are already
searing hot, is likely to get less! So, wet
places get wetter, dry places get dryer, and
the frequency of extreme weather events (huge
rainstorms or huge droughts, like we are having in
Southern California) is likely to increase as the
climate rapidly warms.
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